Honestly, can't really tell you. I did the build, but we had to use a thundermax ecm that the customer wanted. The initial download apparently wasn't right, so it wasn't rumning right when I did the initial test ride. Plus, break-in period, so I didn't get on it much. I believe that after consulting with thundermax, our dyno guy got it lined out. It was supposed to come back for final runs after the break-in, but I don't know that I've seen it again.